scholarly journals Radiation Efficient Unidirectional Low-Profile Slot Antenna Elements for X-Band Application

2005 ◽  
Vol 3 ◽  
pp. 143-146
Author(s):  
C. Löcker ◽  
T. Vaupel ◽  
T. F. Eibert
Keyword(s):  
Parallel Plate ◽  
Radiation Efficiency ◽  
Slot Antenna ◽  
Coupling Coefficients ◽  
Rectangular Slot ◽  
Mode Suppression ◽  
Low Profile ◽  
Shorting Pin ◽  
Strong Excitation ◽  
Back Reflector

Abstract. Slots in metallic ground planes are very promising candidates for conformal antenna applications. However, a low-profile unidirectional antenna requires a back reflector close to the slot and the resulting stripline feed causes strong excitation of parallel-plate modes. In this contribution, we consider unidirectional reflector-backed slot configurations with parallel-plate mode suppression by shorting pins. Starting from a parametric study with respect to shorting pin location and back reflector distance, we present a stripline-fed rectangular slot element with radiation efficiency of more than 80% and a bandwidth of about 5% at centre frequency 10GHz. A careful optimisation of shorting pin locations guarantees reliable parallel-plate mode suppression without deteriorating the slot radiation behaviour. Coupling coefficients between parallel and aligned rectangular slot elements are presented. For increased bandwidth applications, a bow-tie slot element with about 8% bandwidth and radiation efficiency of close to 80% is proposed.

Polarization Reconfigurable Dual-Band Rectangular Slot Antenna

Frequenz ◽  
2019 ◽  
Vol 73 (9-10) ◽  
pp. 339-351
Author(s):  
Rohit Kumar Saini
Keyword(s):  
Circular Polarization ◽  
Linear Polarization ◽  
Dual Band ◽  
Slot Antenna ◽  
Pin Diodes ◽  
Rectangular Slot ◽  
Left Hand ◽  
Right Hand ◽  
Lower Band ◽  
The Senses

Abstract A novel dual-band rectangular slot antenna is presented for dual-sense reconfigurable polarization. A W-shaped microstrip feedline and two rectangular parasitic patches are used to obtain dual-band circular polarization. Further, the feedline is modified so that the senses of polarization at the two bands are opposite. By introducing PIN-diodes in the feed lines, polarization can be switched among left-hand circular polarization (LHCP), right-hand circular polarization (RHCP), and linear polarization (LP). A prototype dual-band dual-sense antenna with f01 = 1.9 GHz and f02 = 3.45 GHz is fabricated in a 1.6 mm thick FR4 substrate. The measured circular polarized bandwidths are more than 7.6 % for the lower band and 5 % for the upper band.

Tapered slot antenna array with parallel plate waveguides

2003 ◽  
Author(s):  
S. Yamaguchi ◽  
K. Yamashita ◽  
K. Nishizawa ◽  
H. Fushimi ◽  
H. Miyashita ◽  
...  
Keyword(s):  
Antenna Array ◽  
Parallel Plate ◽  
Slot Antenna

Radiation characteristics of sharply directed conical waveguide-slot antenna arrays

2021 ◽  
Author(s):  
L.I. Ponomarev ◽  
A.A. Vasin ◽  
О.V. Terekhin ◽  
O.A. Volkov ◽  
L.S. Turko ◽  
...  
Keyword(s):  
Antenna Arrays ◽  
Linear Polarization ◽  
Practical Interest ◽  
Directional Pattern ◽  
Conical Surface ◽  
Slot Antenna ◽  
Waveguide Slot ◽  
Cone Axis ◽  
Electrodynamic Modeling ◽  
Waveguide Slot Antenna

Currently, much attention is paid to antenna arrays, the emitters of which can be located in the bow of unmanned aerial vehicles (UAVs). Emitters can be longitudinal, transverse or oblique slots located along the generatrix of the cone on the conducting surface. A number of specific requirements are imposed on such ARs used in on-board radar systems (radars) of UAVs, among which we can note the need to form a highly directional total-difference directional pattern (DP) with a maximum of the total DP and a minimum of a difference DP in the direction of the UAV flight axis, as well as high gain and slope of the difference characteristic. The aim of this work was to study the radiation of a waveguide-slot antenna array (WASAA) installed on a conical surface and providing linear polarization of the emitted field in the direction of the cone axis. For this, electrodynamic modeling of various configurations of WASAA, located both in free space and on a conical surface, was carried out. For the developed models of antennas, the directivity characteristics and their dependence on the geometry and dimensions of the WASAA are determined. The results of an experimental study of the characteristics of a model of a conical antenna emitting a field of linear polarization in the direction of the cone axis are presented. The experimental results are compared with the results of electrodynamic modeling. The results obtained are of practical interest for the development of airborne antenna UAVs.

Ultra-Wideband Tapered Slot Antenna Arrays with Parallel-Plate Waveguides

2010 ◽  
Vol E93-B (5) ◽  
pp. 1248-1255 ◽  
Author(s):  
Satoshi YAMAGUCHI ◽  
Hiroaki MIYASHITA ◽  
Toru TAKAHASHI ◽  
Masataka OTSUKA ◽  
Yoshihiko KONISHI
Keyword(s):  
Antenna Arrays ◽  
Parallel Plate ◽  
Ultra Wideband ◽  
Slot Antenna
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